static int
dirfixed(uchar *p, uchar *e, Dir *d)
{
int len;
len = GBIT16(p)+BIT16SZ;
if(p + len > e)
return -1;
p += BIT16SZ; /* ignore size */
d->type = devno(GBIT16(p), 1);
p += BIT16SZ;
d->dev = GBIT32(p);
p += BIT32SZ;
d->qid.type = GBIT8(p);
p += BIT8SZ;
d->qid.vers = GBIT32(p);
p += BIT32SZ;
d->qid.path = GBIT64(p);
p += BIT64SZ;
d->mode = GBIT32(p);
p += BIT32SZ;
d->atime = GBIT32(p);
p += BIT32SZ;
d->mtime = GBIT32(p);
p += BIT32SZ;
d->length = GBIT64(p);
return len;
}
static u8* gqid(u8 *p, u8 *ep, Qid *q)
{
if(p+QIDSZ > ep)
return nil;
q->type = GBIT8(p);
p += BIT8SZ;
q->vers = GBIT32(p);
p += BIT32SZ;
q->path = GBIT32(p);
p += BIT64SZ;
return p;
}
unsigned int convM2kstat(uint8_t * buf, unsigned int nbuf, struct kstat *ks)
{
uint8_t *p, *ebuf;
char *sv[4];
int i, ns;
uint32_t junk;
if (nbuf < STATFIXLEN)
return 0;
p = buf;
ebuf = buf + nbuf;
p += BIT16SZ; /* ignore size */
junk /*kd->d_type */ = GBIT16(p);
p += BIT16SZ;
ks->st_rdev = ks->st_dev = GBIT32(p);
p += BIT32SZ;
junk /*qid.type */ = GBIT8(p);
p += BIT8SZ;
junk /*qid.vers */ = GBIT32(p);
p += BIT32SZ;
ks->st_ino = GBIT64(p);
p += BIT64SZ;
ks->st_mode = GBIT32(p);
if (ks->st_mode & DMDIR) {
ks->st_mode &= ~DMDIR;
ks->st_mode |= __S_IFDIR;
} else if (ks->st_mode & DMSYMLINK) {
ks->st_mode &= ~DMSYMLINK;
ks->st_mode |= __S_IFLNK;
} else {
ks->st_mode |= __S_IFREG;
}
p += BIT32SZ;
ks->st_atime.tv_sec = GBIT32(p);
p += BIT32SZ;
ks->st_mtime.tv_sec = GBIT32(p);
p += BIT32SZ;
ks->st_size = GBIT64(p);
p += BIT64SZ;
ks->st_blksize = 512;
ks->st_blocks = ROUNDUP(ks->st_size, ks->st_blksize) / ks->st_blksize;
ks->st_nlink = 2; // links make no sense any more.
ks->st_uid = ks->st_gid = 0;
return p - buf;
}
uchar*
read9ppkt(Ioproc *io, int fd)
{
uchar buf[4], *pkt;
int n, nn;
n = ioreadn(io, fd, buf, 4);
if(n != 4)
return nil;
n = GBIT32(buf);
if(n > MAXMSGSIZE)
return nil;
pkt = emalloc(n);
PBIT32(pkt, n);
nn = ioreadn(io, fd, pkt+4, n-4);
if(nn != n-4){
free(pkt);
return nil;
}
/* would do this if we ever got one of these, but we only generate them
if(pkt[4] == Ropenfd){
newfd = iorecvfd(io, fd);
PBIT32(pkt+n-4, newfd);
}
*/
return pkt;
}
int
xopenfd(Msg *m)
{
char errs[ERRMAX];
int n, p[2];
Conn *nc;
if(pipe(p) < 0){
rerrstr(errs, sizeof errs);
err(m, errs);
/* XXX return here? */
}
if(verbose) fprint(2, "%T xopen pipe %d %d...", p[0], p[1]);
/* now we're committed. */
/* a new connection for this fid */
nc = emalloc(sizeof(Conn));
nc->internal = chancreate(sizeof(void*), 0);
/* a ref for us */
nc->fdfid = m->fid;
m->fid->ref++;
nc->fdfid->openfd++;
nc->fdmode = m->tx.mode;
nc->fd = p[0];
/* a thread to tend the pipe */
threadcreate(openfdthread, nc, STACK);
/* if mode is ORDWR, that openfdthread will write; start a reader */
if((m->tx.mode&3) == ORDWR){
nc = emalloc(sizeof(Conn));
nc->internal = chancreate(sizeof(void*), 0);
nc->fdfid = m->fid;
m->fid->ref++;
nc->fdfid->openfd++;
nc->fdmode = OREAD;
nc->fd = dup(p[0], -1);
threadcreate(openfdthread, nc, STACK);
}
/* steal fid from other connection */
if(delhash(m->c->fid, m->fid->cfid, m->fid) == 0)
fidput(m->fid);
/* rewrite as Ropenfd */
m->rx.type = Ropenfd;
n = GBIT32(m->rpkt);
m->rpkt = erealloc(m->rpkt, n+4);
PBIT32(m->rpkt+n, p[1]);
n += 4;
PBIT32(m->rpkt, n);
m->rpkt[4] = Ropenfd;
m->rx.unixfd = p[1];
return 0;
}
void
rewritehdr(Fcall *f, uchar *pkt)
{
int i, n;
n = GBIT32(pkt);
PBIT16(pkt+5, f->tag);
switch(f->type){
case Tversion:
case Rversion:
restring(pkt, n, f->version);
break;
case Tauth:
PBIT32(pkt+7, f->afid);
restring(pkt, n, f->uname);
restring(pkt, n, f->aname);
break;
case Tflush:
PBIT16(pkt+7, f->oldtag);
break;
case Tattach:
restring(pkt, n, f->uname);
restring(pkt, n, f->aname);
PBIT32(pkt+7, f->fid);
PBIT32(pkt+11, f->afid);
break;
case Twalk:
PBIT32(pkt+7, f->fid);
PBIT32(pkt+11, f->newfid);
for(i=0; i<f->nwname; i++)
restring(pkt, n, f->wname[i]);
break;
case Tcreate:
restring(pkt, n, f->name);
/* fall through */
case Topen:
case Tclunk:
case Tremove:
case Tstat:
case Twstat:
case Twrite:
PBIT32(pkt+7, f->fid);
break;
case Tread:
PBIT32(pkt+7, f->fid);
PBIT64(pkt+11, f->offset);
break;
case Rerror:
restring(pkt, n, f->ename);
break;
}
}
static
uint8_t *gqid(uint8_t * p, uint8_t * ep, struct qid *q)
{
if (p + QIDSZ > ep)
return NULL;
q->type = GBIT8(p);
p += BIT8SZ;
q->vers = GBIT32(p);
p += BIT32SZ;
q->path = GBIT64(p);
p += BIT64SZ;
return p;
}
int
mwrite9p(Ioproc *io, int fd, uchar *pkt)
{
int n, nfd;
n = GBIT32(pkt);
if(verbose > 2) fprint(2, "%T write %d %d %.*H\n", fd, n, n, pkt);
if(verbose > 1) fprint(2, "%T before iowrite\n");
if(iowrite(io, fd, pkt, n) != n){
fprint(2, "%T write error: %r\n");
return -1;
}
if(verbose > 1) fprint(2, "%T after iowrite\n");
if(pkt[4] == Ropenfd){
nfd = GBIT32(pkt+n-4);
if(iosendfd(io, fd, nfd) < 0){
fprint(2, "%T send fd error: %r\n");
return -1;
}
}
return 0;
}
static usize
dirfixed(uint8_t *p, uint8_t *e, Dir *d)
{
int len;
Dev *dev;
len = GBIT16(p)+BIT16SZ;
if(p + len > e)
return 0;
p += BIT16SZ; /* ignore size */
dev = devtabget(GBIT16(p), 1); //XDYNX
if(dev != nil){
d->type = dev->dc;
//devtabdecr(dev);
}
else
d->type = -1;
p += BIT16SZ;
d->dev = GBIT32(p);
p += BIT32SZ;
d->qid.type = GBIT8(p);
p += BIT8SZ;
d->qid.vers = GBIT32(p);
p += BIT32SZ;
d->qid.path = GBIT64(p);
p += BIT64SZ;
d->mode = GBIT32(p);
p += BIT32SZ;
d->atime = GBIT32(p);
p += BIT32SZ;
d->mtime = GBIT32(p);
p += BIT32SZ;
d->length = GBIT64(p);
return len;
}
void
inputthread(void *arg)
{
uchar *pkt;
int n, nn, tag;
Msg *m;
Ioproc *io;
threadsetname("input");
if(verbose) fprint(2, "%T input thread\n");
io = ioproc();
USED(arg);
while((pkt = read9ppkt(io, 0)) != nil){
n = GBIT32(pkt);
if(n < 7){
fprint(2, "%T short 9P packet from server\n");
free(pkt);
continue;
}
if(verbose > 2) fprint(2, "%T read %.*H\n", n, pkt);
tag = GBIT16(pkt+5);
if((m = msgget(tag)) == nil){
fprint(2, "%T unexpected 9P response tag %d\n", tag);
free(pkt);
continue;
}
if((nn = convM2S(pkt, n, &m->rx)) != n){
fprint(2, "%T bad packet - convM2S %d but %d\n", nn, n);
free(pkt);
msgput(m);
continue;
}
if(verbose > 1) fprint(2, "%T * -> %F%s\n", &m->rx,
m->internal ? " (internal)" : "");
m->rpkt = pkt;
m->rx.tag = m->ctag;
if(m->internal)
sendp(m->c->internal, m);
else if(m->c->outq)
sendq(m->c->outq, m);
else
msgput(m);
}
closeioproc(io);
/*fprint(2, "%T input eof\n"); */
threadexitsall(0);
}
static int
readmsg(Chan *c, void *abuf, int n, int *ninep)
{
int fd, len;
uint8_t *buf;
buf = abuf;
fd = c->chan;
qlock(&c->rlock);
if(readn(fd, buf, 3) != 3){
qunlock(&c->rlock);
print("readn(3) fails: %r\n");
return -1;
}
if((50 <= buf[0] && buf[0] <= 87 && (buf[0]&1)==0 && GBIT16(buf+1) == 0xFFFF)
|| buf[0] == 86 /* Tattach */){
*ninep = 1;
/* assume message boundaries */
n = read(fd, buf+3, n-3);
if(n < 0){
qunlock(&c->rlock);
return -1;
}
return n+3;
}
*ninep = 2;
if(read(fd, buf+3, 1) != 1){
qunlock(&c->rlock);
print("read(1) fails: %r\n");
return -1;
}
len = GBIT32(buf);
if(len > n){
print("msg too large\n");
qunlock(&c->rlock);
return -1;
}
if(readn(fd, buf+4, len-4) != len-4){
print("readn(%d) fails: %r\n", len-4);
qunlock(&c->rlock);
return -1;
}
qunlock(&c->rlock);
return len;
}
void
repack(Fcall *f, uchar **ppkt)
{
uint n, nn;
uchar *pkt;
pkt = *ppkt;
n = GBIT32(pkt);
nn = sizeS2M(f);
if(nn > n){
free(pkt);
pkt = emalloc(nn);
*ppkt = pkt;
}
n = convS2M(f, pkt, nn);
if(n <= BIT16SZ)
sysfatal("convS2M conversion error");
if(n != nn)
sysfatal("convS2M and sizeS2M disagree");
}
Msg*
mread9p(Ioproc *io, int fd)
{
int n, nn;
uchar *pkt;
Msg *m;
if((pkt = read9ppkt(io, fd)) == nil)
return nil;
m = msgnew(0);
m->tpkt = pkt;
n = GBIT32(pkt);
nn = convM2S(pkt, n, &m->tx);
if(nn != n){
fprint(2, "%T read bad packet from %d\n", fd);
return nil;
}
return m;
}
static int
pcicfgrw(Pcidev *pcidev, int rno, int data, int len, int read)
{
uchar buf[4];
if(read){
memset(buf, 0, sizeof(buf));
if(pread(pcidev->rawfd, buf, len, rno) != len)
return -1;
switch(len){
case 1:
return GBIT8(buf);
case 2:
return GBIT16(buf);
case 4:
return GBIT32(buf);
default:
abort();
}
} else {
switch(len){
case 1:
PBIT8(buf, data);
break;
case 2:
PBIT16(buf, data);
break;
case 4:
PBIT32(buf, data);
break;
default:
abort();
}
if(pwrite(pcidev->rawfd, buf, len, rno) != len)
return -1;
}
return 0;
}
/*
* no syntactic checks.
* three causes for error:
* 1. message size field is incorrect
* 2. input buffer too short for its own data (counts too long, etc.)
* 3. too many names or qids
* gqid() and gstring() return nil if they would reach beyond buffer.
* main switch statement checks range and also can fall through
* to test at end of routine.
*/
uint
convM2S(uchar *ap, uint nap, Fcall *f)
{
uchar *p, *ep;
uint i, size;
p = ap;
ep = p + nap;
if(p+BIT32SZ+BIT8SZ+BIT16SZ > ep)
return 0;
size = GBIT32(p);
p += BIT32SZ;
if(size < BIT32SZ+BIT8SZ+BIT16SZ)
return 0;
f->type = GBIT8(p);
p += BIT8SZ;
f->tag = GBIT16(p);
p += BIT16SZ;
switch(f->type)
{
default:
return 0;
case Tversion:
if(p+BIT32SZ > ep)
return 0;
f->msize = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->version);
break;
case Tflush:
if(p+BIT16SZ > ep)
return 0;
f->oldtag = GBIT16(p);
p += BIT16SZ;
break;
case Tauth:
if(p+BIT32SZ > ep)
return 0;
f->afid = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->uname);
if(p == nil)
break;
p = gstring(p, ep, &f->aname);
if(p == nil)
break;
break;
case Tattach:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
if(p+BIT32SZ > ep)
return 0;
f->afid = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->uname);
if(p == nil)
break;
p = gstring(p, ep, &f->aname);
if(p == nil)
break;
break;
case Twalk:
if(p+BIT32SZ+BIT32SZ+BIT16SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->newfid = GBIT32(p);
p += BIT32SZ;
f->nwname = GBIT16(p);
p += BIT16SZ;
if(f->nwname > MAXWELEM)
return 0;
for(i=0; i<f->nwname; i++){
p = gstring(p, ep, &f->wname[i]);
if(p == nil)
break;
}
break;
case Topen:
if(p+BIT32SZ+BIT8SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->mode = GBIT8(p);
p += BIT8SZ;
break;
case Tcreate:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->name);
if(p == nil)
break;
if(p+BIT32SZ+BIT8SZ > ep)
return 0;
f->perm = GBIT32(p);
p += BIT32SZ;
f->mode = GBIT8(p);
p += BIT8SZ;
break;
case Tread:
if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->offset = GBIT64(p);
p += BIT64SZ;
f->count = GBIT32(p);
p += BIT32SZ;
break;
case Twrite:
if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->offset = GBIT64(p);
p += BIT64SZ;
f->count = GBIT32(p);
p += BIT32SZ;
if(p+f->count > ep)
return 0;
f->data = (char*)p;
p += f->count;
break;
case Tclunk:
case Tremove:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
break;
case Tstat:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
break;
case Twstat:
if(p+BIT32SZ+BIT16SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->nstat = GBIT16(p);
p += BIT16SZ;
if(p+f->nstat > ep)
return 0;
f->stat = p;
p += f->nstat;
break;
/*
*/
case Rversion:
if(p+BIT32SZ > ep)
return 0;
f->msize = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->version);
break;
case Rerror:
p = gstring(p, ep, &f->ename);
break;
case Rflush:
break;
case Rauth:
p = gqid(p, ep, &f->aqid);
if(p == nil)
break;
break;
case Rattach:
p = gqid(p, ep, &f->qid);
if(p == nil)
break;
break;
case Rwalk:
if(p+BIT16SZ > ep)
return 0;
f->nwqid = GBIT16(p);
p += BIT16SZ;
if(f->nwqid > MAXWELEM)
return 0;
for(i=0; i<f->nwqid; i++){
p = gqid(p, ep, &f->wqid[i]);
if(p == nil)
break;
}
break;
case Ropen:
case Rcreate:
p = gqid(p, ep, &f->qid);
if(p == nil)
break;
if(p+BIT32SZ > ep)
return 0;
f->iounit = GBIT32(p);
p += BIT32SZ;
break;
case Rread:
if(p+BIT32SZ > ep)
return 0;
f->count = GBIT32(p);
p += BIT32SZ;
if(p+f->count > ep)
return 0;
f->data = (char*)p;
p += f->count;
break;
case Rwrite:
if(p+BIT32SZ > ep)
return 0;
f->count = GBIT32(p);
p += BIT32SZ;
break;
case Rclunk:
case Rremove:
break;
case Rstat:
if(p+BIT16SZ > ep)
return 0;
f->nstat = GBIT16(p);
p += BIT16SZ;
if(p+f->nstat > ep)
return 0;
f->stat = p;
p += f->nstat;
break;
case Rwstat:
break;
}
if(p==nil || p>ep)
return 0;
if(ap+size == p)
return size;
return 0;
}
uint
_convM2D(uint8_t *buf, uint nbuf, Dir *d, char *strs)
{
uint8_t *p, *ebuf;
char *sv[4];
int i, ns, nsv[4];
p = buf;
ebuf = buf + nbuf;
p += BIT16SZ; /* ignore size */
d->type = GBIT16(p);
p += BIT16SZ;
d->dev = GBIT32(p);
p += BIT32SZ;
d->qid.type = GBIT8(p);
p += BIT8SZ;
d->qid.vers = GBIT32(p);
p += BIT32SZ;
d->qid.path = GBIT64(p);
p += BIT64SZ;
d->mode = GBIT32(p);
p += BIT32SZ;
d->atime = GBIT32(p);
p += BIT32SZ;
d->mtime = GBIT32(p);
p += BIT32SZ;
d->length = GBIT64(p);
p += BIT64SZ;
d->name = nil;
d->uid = nil;
d->gid = nil;
d->muid = nil;
for(i = 0; i < 4; i++){
if(p + BIT16SZ > ebuf)
return 0;
ns = GBIT16(p);
p += BIT16SZ;
if(p + ns > ebuf)
return 0;
if(strs){
nsv[i] = ns;
sv[i] = strs;
memmove(strs, p, ns);
strs += ns;
*strs++ = '\0';
}
p += ns;
}
if(strs){
d->name = sv[0];
d->uid = sv[1];
d->gid = sv[2];
d->muid = sv[3];
}else{
d->name = nullstring;
d->uid = nullstring;
d->gid = nullstring;
d->muid = nullstring;
}
return p - buf;
}
u16 convM2S(u8 *ap, u16 nap, estyx_fcall_t *f)
{
u8 *p, *ep;
u16 i, size;
p = ap;
ep = p + nap;
if(p+BIT32SZ+BIT8SZ+BIT16SZ > ep)
return 0;
size = GBIT32(p);
p += BIT32SZ;
if (size<BIT32SZ+BIT8SZ+BIT16SZ)
return 0;
f->type = GBIT8(p);
p += BIT8SZ;
f->tag = GBIT16(p);
p += BIT16SZ;
switch(f->type) {
default:
return 0;
case Tversion:
if(p+BIT32SZ > ep)
return 0;
f->u.version.msize = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->u.version.version);
break;
case Tflush:
if(p+BIT16SZ > ep)
return 0;
f->u.oldtag = GBIT16(p);
p += BIT16SZ;
break;
case Tauth:
if(p+BIT32SZ > ep)
return 0;
f->u.attach.afid = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->u.attach.uname);
if(p == nil)
break;
p = gstring(p, ep, &f->u.attach.aname);
if(p == nil)
break;
break;
case Tattach:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
if(p+BIT32SZ > ep)
return 0;
f->u.attach.afid = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->u.attach.uname);
if(p == nil)
break;
p = gstring(p, ep, &f->u.attach.aname);
if(p == nil)
break;
break;
case Twalk:
if(p+BIT32SZ+BIT32SZ+BIT16SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->u.twalk.newfid = GBIT32(p);
p += BIT32SZ;
f->u.twalk.nwname = GBIT16(p);
p += BIT16SZ;
if(f->u.twalk.nwname > MAXWELEM)
return 0;
for(i=0; i<f->u.twalk.nwname; i++){
p = gstring(p, ep, &f->u.twalk.wname[i]);
if(p == nil)
break;
}
break;
case Topen:
if(p+BIT32SZ+BIT8SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->u.create.mode = GBIT8(p);
p += BIT8SZ;
break;
case Tcreate:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->u.create.name);
if(p == nil)
break;
if(p+BIT32SZ+BIT8SZ > ep)
return 0;
f->u.create.perm = GBIT32(p);
p += BIT32SZ;
f->u.create.mode = GBIT8(p);
p += BIT8SZ;
break;
case Tread:
if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->u.rw.offset = GBIT32(p);
p += BIT64SZ;
f->u.rw.count = GBIT32(p);
p += BIT32SZ;
break;
case Twrite:
if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->u.rw.offset = GBIT32(p);
p += BIT64SZ;
f->u.rw.count = GBIT32(p);
p += BIT32SZ;
if(p+f->u.rw.count > ep)
return 0;
f->u.rw.data = p;
p += f->u.rw.count;
break;
case Tclunk:
case Tremove:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
break;
case Tstat:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
break;
case Twstat:
if(p+BIT32SZ+BIT16SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->u.stat.nstat = GBIT16(p);
p += BIT16SZ;
if(p+f->u.stat.nstat > ep)
return 0;
f->u.stat.stat = p;
p += f->u.stat.nstat;
break;
#if 0
// we never receive R packets so no need for this
/*
*/
case Rversion:
if(p+BIT32SZ > ep)
return 0;
f->u.version.msize = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->u.version.version);
break;
case Rerror:
p = gstring(p, ep, &f->u.ename);
break;
case Rflush:
break;
case Rauth:
p = gqid(p, ep, &f->u.aqid);
if(p == nil)
break;
break;
case Rattach:
p = gqid(p, ep, &f->u.open.qid);
if(p == nil)
break;
break;
case Rwalk:
if(p+BIT16SZ > ep)
return 0;
f->u.rwalk.nwqid = GBIT16(p);
p += BIT16SZ;
if(f->u.rwalk.nwqid > MAXWELEM)
return 0;
for(i=0; i<f->u.rwalk.nwqid; i++){
p = gqid(p, ep, &f->u.rwalk.wqid[i]);
if(p == nil)
break;
}
break;
case Ropen:
case Rcreate:
p = gqid(p, ep, &f->u.open.qid);
if(p == nil)
break;
if(p+BIT32SZ > ep)
return 0;
f->u.open.iounit = GBIT32(p);
p += BIT32SZ;
break;
case Rread:
if(p+BIT32SZ > ep) return 0;
f->u.rw.count = GBIT32(p);
p += BIT32SZ;
if(p+f->u.rw.count > ep)
return 0;
f->u.rw.data = data;
p += f->u.rw.count;
break;
case Rwrite:
if(p+BIT32SZ > ep)
return 0;
f->u.rw.count = GBIT32(p);
p += BIT32SZ;
break;
case Rclunk:
case Rremove:
break;
case Rstat:
if(p+BIT16SZ > ep)
return 0;
f->u.stat.nstat = GBIT16(p);
p += BIT16SZ;
if(p+f->u.stat.nstat > ep)
return 0;
f->u.stat.stat = p;
p += f->u.stat.nstat;
break;
case Rwstat:
break;
#endif
}
if(p==nil || p>ep)
return 0;
if(ap+size == p)
return size;
return 0;
}
unsigned int convM2kdirent(uint8_t * buf, unsigned int nbuf, struct kdirent *kd,
char *strs)
{
uint8_t *p, *ebuf;
char *sv[4];
int i, ns;
uint32_t junk;
printd("%s >>>>>>>>>nbuf %d STATFIXLEN %d\n", __func__, nbuf, STATFIXLEN);
if (nbuf < STATFIXLEN)
return 0;
p = buf;
ebuf = buf + nbuf;
p += BIT16SZ; /* ignore size */
kd->d_type = GBIT16(p);
p += BIT16SZ;
junk = GBIT32(p);
p += BIT32SZ;
junk = GBIT8(p);
p += BIT8SZ;
junk = GBIT32(p);
p += BIT32SZ;
kd->d_ino = GBIT64(p);
p += BIT64SZ;
junk /* mode */ = GBIT32(p);
p += BIT32SZ;
junk /*d->atime */ = GBIT32(p);
p += BIT32SZ;
junk /*d->mtime */ = GBIT32(p);
p += BIT32SZ;
junk /*d->length */ = GBIT64(p);
p += BIT64SZ;
/* for now, uids in akaros are ints. Does not
* matter; kdirents are limited in what they tell you.
* get the name, ignore the rest. Maybe we can
* fix this later.
*/
for (i = 0; i < 4; i++) {
if (p + BIT16SZ > ebuf)
return 0;
ns = GBIT16(p);
p += BIT16SZ;
if (p + ns > ebuf)
return 0;
if (strs) {
sv[i] = strs;
memmove(strs, p, ns);
strs += ns;
*strs++ = '\0';
}
if (i == 0) {
kd->d_reclen = ns;
printd("memmove %p %p %d\n", kd->d_name, p, ns);
memmove(kd->d_name, p, ns);
kd->d_name[ns] = 0;
}
p += ns;
}
printd("%s returns %d %s\n", __func__, p - buf, kd->d_name);
return p - buf;
}
