/* no memory allocation, direct copy */
int
psbuf_do_data(struct puffs_framebuf *pb, uint8_t *data, uint32_t *dlen)
{
void *win;
size_t bufoff, winlen;
uint32_t len, dataoff;
if (psbuf_get_type(pb) != SSH_FXP_DATA) {
uint32_t val;
if (psbuf_get_type(pb) != SSH_FXP_STATUS)
return INVALRESPONSE;
if (psbuf_get_4(pb, &val) != 0)
return INVALRESPONSE;
if (val != SSH_FX_EOF)
return sftperr_to_errno(val);
*dlen = 0;
return 0;
}
if (psbuf_get_4(pb, &len) != 0)
return INVALRESPONSE;
if (*dlen < len)
return EINVAL;
*dlen = 0;
dataoff = 0;
while (dataoff < len) {
winlen = len-dataoff;
bufoff = puffs_framebuf_telloff(pb);
if (puffs_framebuf_getwindow(pb, bufoff,
&win, &winlen) == -1)
return EINVAL;
if (winlen == 0)
break;
memcpy(data + dataoff, win, winlen);
dataoff += winlen;
}
*dlen = dataoff;
return 0;
}
int
psbuf_expect_name(struct puffs_framebuf *pb, uint32_t *count)
{
CHECKCODE(pb, SSH_FXP_NAME);
FAILRV(psbuf_get_4(pb, count));
return 0;
}
int
psbuf_expect_status(struct puffs_framebuf *pb)
{
uint32_t error;
if (psbuf_get_type(pb) != SSH_FXP_STATUS)
return INVALRESPONSE;
FAILRV(psbuf_get_4(pb, &error));
return sftperr_to_errno(error);
}
static int
expectcode(struct puffs_framebuf *pb, int value)
{
uint32_t error;
uint8_t type;
type = psbuf_get_type(pb);
if (type == value)
return 0;
if (type != SSH_FXP_STATUS)
return INVALRESPONSE;
FAILRV(psbuf_get_4(pb, &error));
return sftperr_to_errno(error);
}
int
psbuf_get_str(struct puffs_framebuf *pb, char **strp, uint32_t *strlenp)
{
char *str;
uint32_t len;
FAILRV(psbuf_get_4(pb, &len));
if (puffs_framebuf_remaining(pb) < len)
return EPROTO;
str = emalloc(len+1);
puffs_framebuf_getdata(pb, str, len);
str[len] = '\0';
*strp = str;
if (strlenp)
*strlenp = len;
return 0;
}
int
psbuf_get_vattr(struct puffs_framebuf *pb, struct vattr *vap)
{
uint32_t flags;
uint32_t val;
uint32_t tmpval;
puffs_vattr_null(vap);
FAILRV(psbuf_get_4(pb, &flags));
if (flags & SSH_FILEXFER_ATTR_SIZE) {
FAILRV(psbuf_get_8(pb, &vap->va_size));
vap->va_bytes = vap->va_size;
}
if (flags & SSH_FILEXFER_ATTR_UIDGID) {
FAILRV(psbuf_get_4(pb, &vap->va_uid));
FAILRV(psbuf_get_4(pb, &vap->va_gid));
}
if (flags & SSH_FILEXFER_ATTR_PERMISSIONS) {
FAILRV(psbuf_get_4(pb, &tmpval));
vap->va_mode = tmpval;
vap->va_type = puffs_mode2vt(vap->va_mode);
}
if (flags & SSH_FILEXFER_ATTR_ACCESSTIME) {
/*
* XXX: this is utterly wrong if we want to speak
* protocol version 3, but it seems like the
* "internet standard" for doing this
*/
FAILRV(psbuf_get_4(pb, &val));
vap->va_atime.tv_sec = val;
FAILRV(psbuf_get_4(pb, &val));
vap->va_mtime.tv_sec = val;
/* make ctime the same as mtime */
vap->va_ctime.tv_sec = val;
vap->va_atime.tv_nsec = 0;
vap->va_ctime.tv_nsec = 0;
vap->va_mtime.tv_nsec = 0;
}
return 0;
}
int
psshfs_handshake(struct puffs_usermount *pu, int fd)
{
struct psshfs_ctx *pctx = puffs_getspecific(pu);
struct puffs_framebuf *pb;
struct puffs_pathobj *po_root;
struct puffs_node *pn_root;
struct vattr va, *rva;
const struct extunit *extu;
char *rootpath;
char *ext, *val;
uint32_t count;
int rv, done;
pb = psbuf_makeout();
psbuf_put_1(pb, SSH_FXP_INIT);
psbuf_put_4(pb, SFTP_PROTOVERSION);
DO_IO(psbuf_write, pu, pb, fd, &done, rv);
puffs_framebuf_recycle(pb);
DO_IO(psbuf_read, pu, pb, fd, &done, rv);
if (psbuf_get_type(pb) != SSH_FXP_VERSION)
reterr((stderr, "invalid server response: %d",
psbuf_get_type(pb)), EPROTO);
pctx->protover = psbuf_get_reqid(pb);
/*
* Check out which extensions are available. Currently
* we are only interested in the openssh statvfs extension.
*/
for (;;) {
if (psbuf_get_str(pb, &ext, NULL) != 0)
break;
if (psbuf_get_str(pb, &val, NULL) != 0)
break;
for (extu = exttable; extu->ext; extu++)
if (strcmp(ext, extu->ext) == 0
&& strcmp(val, extu->val) == 0)
pctx->extensions |= extu->extflag;
}
/* scope out our rootpath */
psbuf_recycleout(pb);
psbuf_put_1(pb, SSH_FXP_REALPATH);
psbuf_put_4(pb, NEXTREQ(pctx));
psbuf_put_str(pb, pctx->mountpath);
DO_IO(psbuf_write, pu, pb, fd, &done, rv);
puffs_framebuf_recycle(pb);
DO_IO(psbuf_read, pu, pb, fd, &done, rv);
if (psbuf_get_type(pb) != SSH_FXP_NAME)
reterr((stderr, "invalid server realpath response for \"%s\"",
pctx->mountpath), EPROTO);
if (psbuf_get_4(pb, &count) == -1)
reterr((stderr, "invalid realpath response: count"), EPROTO);
if (psbuf_get_str(pb, &rootpath, NULL) == -1)
reterr((stderr, "invalid realpath response: rootpath"), EPROTO);
/* stat the rootdir so that we know it's a dir */
psbuf_recycleout(pb);
psbuf_req_str(pb, SSH_FXP_LSTAT, NEXTREQ(pctx), rootpath);
DO_IO(psbuf_write, pu, pb, fd, &done, rv);
puffs_framebuf_recycle(pb);
DO_IO(psbuf_read, pu, pb, fd, &done, rv);
rv = psbuf_expect_attrs(pb, &va);
if (rv)
reterr((stderr, "couldn't stat rootpath"), rv);
puffs_framebuf_destroy(pb);
if (puffs_mode2vt(va.va_mode) != VDIR)
reterr((stderr, "remote path (%s) not a directory", rootpath),
ENOTDIR);
pn_root = puffs_getroot(pu);
rva = &pn_root->pn_va;
puffs_setvattr(rva, &va);
po_root = puffs_getrootpathobj(pu);
if (po_root == NULL)
err(1, "getrootpathobj");
po_root->po_path = rootpath;
po_root->po_len = strlen(rootpath);
return 0;
}